Electrical connector

ABSTRACT

An electrical connector comprising electrical contacts and an insulator body for supporting the electrical contacts, a shank of each of electrical contacts which is supported in the supporting portion of the insulator body, comprises a flat plate portion and three wall members standing on and from the flat plate portion, which are inserted into the hole of the supporting member. The three wall members define a box opening at two sides by incorporating with a portion of the flat plate portion, the box portion being interference-fitted into the hole of the supporting portion and the remaining portion of the flat plate portion being loosely accomodated in the hole. Finger tabs are provided at opposite ends of the flat plate portion and is forced towards one another by the internal surface of the hole.

United States Patent 1 Yamanoue et al. Sept. 4, 1973 [54] ELECTRICAL CONNECTOR 3,696,323 10/1972 Kinkaid et al 339/221 M X 3,002,176 9 1961 Y 339176 M [75] Inventors: Takahisa Yamanoue; Yutaka opp Takeuchl both of TokyoJapan Primary Examiner-Marvin A. Champion [73] Assignee: Japan Aviation Electronics Industry Assistant Examiner--Lawrence J. Staab Limited, Tokyo, Japan Att0rney-C. Cornell Remsen, Jr. et al.

[22] Filed: June 14, 1972 l 2 4 [57] ABSTRACT [211 App 26 0 An electrical connector comprising electrical contacts and an insulator body for supporting the electrical con- [30] Foreign Application Priority Data tacts, a shank of each of electrical contacts which is June 24, 1971 Japan 46/45940 Supported in the Supporting Portion of the insulator body, comprises a flat plate portion and three wall [52] US. Cl..... 339/176 M, 339/217 S, 339/221 M, members standing on and from the flat plate portion,

339/275 R which are inserted into the hole of the supporting mem- 51 Int. 01. H0lr 13/50, non 9/06 The three w ll members define a box opening at 58 Field of Search 339/176 M, 176 MP, two Sides y incorporating with a portion of the flat 339/217 S, 221, 275 R, 275 B, 275 T plate portion, the box portion being interference-fitted into the hole of the supporting portion and the remain- [56] R fe nc Cit d ing portion of the flat plate portion being loosely accomodated in the hole. Finger tabs are provided at Op- 2 711 524 6/1955 Beaver 339,275 T X posite ends of the flat plate portion and is forced to- 3:428:934 2/1969 Reider at al. Q. 339 275 R x wards one another by the meme] Surfaee of the hole 14 Claims, 10 Drawing Figures 2@ I C \\\\\\\\x\\\\- 1 A 24 11/147 II/m PATENIEDSEH HH SHEET 2 BF 3 ELECTRICAL CONNECTOR BACKGROUND OF THE INVENTION This invention relates to improvements of electrical connectors, and, in particular, to multiple-contact electrical connectors.

The recent advance of miniaturization of various electrical and/or electronic elements, parts and/or devices has required miniature electrical connectors and, in particular, miniature connectors each having a plu rality of pairs of mating contacts.

A known miniature electrical connector having a plurality of pairs of mating contacts comprises a plug member and a receptacle member mated thereto, each of which comprising a plurality of contacts of electrical conducting material and an insulator body for supporting the contacts. As shown in FIG. 1 and FIG. 2, the insulator body (5, of each of the plug member (FIG. 1) and the receptacle member (FIG. 2) comprises a supporting portion having holes (7, 17) penetrating therethrough, in which the contacts (1, 11) are inserted and supported, individually. Each of the contacts has two spaced projections (3, 4 13, 14) which are engaged with the step (8, 18) formed in the hole (7, 17)

and the edge (9, 19) of the hole so that the contact if supported to and prevented from falling off the insulator body (5, 15). The insulator body has a portion (51, 151) projecting from the supporting portion, along the side surface of which the contact (1, 11) extends with gradually outwardly curving. In the end surface of the projecting portion is provided, near the edge of the end surface, a groove (6, 16), in which is received a curved or bent end portion (2, 12) of the contact (1, 11). The Contact (1, 11) may be pressed out from one metal sheet and, thereafter, formed a final construction by bending operation. The differences between contacts 1 and 11 in plug and receptacle members are the facts that the base plate portion of the contact 1 in the plug extends in one flat surface but that of the contact 11 in the receptacle is bent not to extend one flat surface as shown by broken lines in FIGS. 1 and 2, and that the projections 3, 4 in the plug are different from the projections l3, 14 in the receptacle in their orientation.

According to the arrangement of FIGS. 1 and 2, there can be provided a miniature electrical connector which is simple in the structure and the producing method and is economical. But each of contacts are loosely inserted in the hole of the insulating body and retained only by engagement between a portion of the insulator body and a pair of spaced projections provided to the contact, so that a gap is provided between the contact and the inner surface of the hole. Therefore, the contact is apt to readily move in the hole. And the flux flows along the contact to the region contacting to the mating contact in soldering lead wires to the terminal portion of the contact. It is required to remove the flowed flux from the contacting region.

In order to complete the engagement between a portion of the insulator body and a pair of spaced projections of thecontact to retain the contact in the insulator body, one projection must be formed by setting up a finger provided to the contact after the contact has been inserted into the hole of the insulator body.

The contact mounted in the receptacle member is complicated in the construction so that the producing process may be complicated. Therefore, the construction of the contact is not economical.

SUMMARY OF THE INVENTION The primary object of this invention is to provide a miniature electrical connector having a construction in which no flux flows along each contact to a contacting region thereof in soldering lead wires to a terminal portion of each contact.

Another object of this invention is to provide an electrical connector in which each contact is mounted in the insulator body without any movement.

A still another object of this invention is to provide an elctrical connector which is simple in producing process and construction, and economical.

According to this invention, there would be obtained an electrical connector comprising a pair of connector members, in each of which contacts are retained in an insulator body in such manner that a portion of shank of each contact is interference-fitted in a hole of the in sulator body, so that flux cannot flow along the contact to a contacting region thereof from terminal portion thereof.

Each contact has yieldable and resilient finger tabs at the shank thereof which is accomodated in the hole of the insulator body so that the contact may be mounted on the insulator body by the action of the resilient finger tabs.

Further objects, features and constructions of this invention will be understood from descriptions of preferred embodiments of this invention referring to annexed drawings in which:

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views of a known plug and receptacle respectively,

FIG. 3 is a perspective view of the insulator for supporting contacts of a plug member according to this invention,

FIG. 4 is a cross-sectional view of the insulator shown in FIG. 3,

FIGS. 5 and 6 are side views as viewed in directions of arrows A and B shown in FIG. 3, respectively,

FIG. 7 is a perspective view of a contact used in plug member of an embodiment of this invention,

FIG. 8 is a cross-sectional view of a plug member in which contacts shown in FIG. 7 are mounted in the insulator shown in FIG. 4,

FIG. 9 is a partial view as viewed in the direction of arrow C shown in FIG. 8,

and, FIG. 10 is a cross-sectional view of the assembled receptacle member of an embodiment of this invention.

DETAILED EMBODIMENT OF PREFERRED EMBODIMENTS Referring FIGS. 3, 4, S and 6, in which an insulator body of a plug member of an embodiment is shown, the insulator body comprises a supporting portion having peripheral flange 22 and holes 27, 28, 29 therein, a projecting wall portion 21 extending from and integrally with the supporting portion having a flat side surface 211 which integrally connects with inner surfaces of holes 27, and an opposite projection wall portion 21' having channels 211. A plurality of grooves are formed at the edge of the end of the projection wall portion 211, between adjacent grooves provided is a separator wall 25 which has inward extensions 26 over adjacent grooves.

At integral connection between the supporting member and the opposite projection wall portion 21', steps 30 are provided at regions corresponding to holes 29, which serves as a means for engaging with a finger (41 in FIG. 7).

Referring to FIG. 7, which illustrates a contact, the contact comprises a shank including flat plate portion 43, U-shape wall portion 36 standing up on and integrally connected to the flat plate portion 43 with the bottom of U extending across the flat plate portion and legs of U extending along the opposite ends of the flat plate portion 43, and a pair of finger tabs 39, 40 extending in a perpendicular direction of the flat plate 43 which integrally connect with opposite ends of the flat plate portion 43 respectively at one portion of each tab and extends from the connecting portions with gradually curving to depart each other.

The flat plate portion 43 integrally connects with the contact blade 34 at a region including the U-shape wall portion 36. The contact blade 34 gradually curves to form a convex, at the free end thereof are formed a tongue 32 and a neck portion 33.

The opposite end of the fiat plate portion 43 integrally connects with the flat plate portion of the terminal portion in which a finger 41 and a hole 42 are formed. The side walls 37, 38 extending along opposite ends of and in a direction perpendicular to the flat plate portion of the terminal, are integrally connected to the finger tabs 39,40, respectively.

Referring to FIGS. 8 and 9, which illustrate assembly of the plug member wherein the contact of FIG. 7 are assembled in the insulator body shown in FIGS. 3-6, the shank portion of the contact is inserted into holes 27, 28, 29.

The box like portion comprising U-shape wall portion 36 and the flat plate portion 43 is interferencefitted into the hole 28. I

It will be understood that the dimension of the hole 28 is slightly less than that of the box like portion.

The flat plate portion 43 and finger tabs 39, 40 are losely inserted into the hole 29. Therefore it will be understood that the hole 29 should be formed with U- shape section, as shown in FIG. 6.

The finger 41 engages with the step 30, so that the contact is prevented from falling off the insulator body in a direction of the contact blade. While the U-shape wall portion 36 engages with the bottom of the hole 28, which is greater than the hole 29, so that the contact is prevented from falling ofi the insulator in a direction of the terminal portion.

The curved finger tabs 39, 40 are inserted into the U- shape hole 29 and, in particular, in portions corresponding to legs of U, and the free ends of individual tabs 39, 40 press inner surfaces of portions of the hole 29, so that the contact is mounted and retained in the insulator body without any movement.

The tongue 32 is received in the groove and engages with the inclined bottom 24 of the groove. It will be easily understood that the inward extensions 26 serves for preventing the removement of the tongue 32 from the groove due to injurious external force acting thereon.

The terminal portion of contact is accomodated in the channel 211 formed on the projection wall 21.

' ln assembling process, the terminal portion is inserted into hole 27 and thereafter, thev contact is pressed with the terminal being passed through the holes 27, 28, 29. When the lead end of the terminal presents out of the hole 29, the terminal portion is pulled by a tool (not shown) having a hook means at the end along the bottom 31 of the channel 211', with the hook means being engaged with the hole 42 of the terminal portion of the contact, so that the shank of the contact is inserted into the holes 27, 28, 29 with the box like portion including Ushape wall portion 36 being interference-fitted to the hole 28. The finger 41 automatically engages with the step 30, when the finger 41 is pulled out of the hole 29.

Thus the contact is retained in the insulator body.

In soldering lead wires (not shown) to the terminal portion, flux flows along the contact but does not flow over the box like portion including U-shape wall portion 36 due to the interference-fit between the box like portion and the hole 28 to be stored in the space defined by U-shape wall portion 36, the flat plate portion 43 and inner surface of the hole 28.

It will be understood that the hole 27 is for guiding the U-shape portion 36 in assembling and has, therefore, a tapered inner surface as seen in FIG. 4.

The height of the wall portion36 is greater than that of each of finger tabs 39, 40 and the side wall portions 37, 38, in order that the contact may be inserted into the holes 29, 30, 31 to be assembled to the insulator body.

FIG. 10 shows a receptacle member which has similar construction as the plug member, except that the offset portion 45 is formed at the intermediate region of the flat plate portion 43, and that a hole portion of the U-shape hole 29 corresponding to the bottom of U is, accordingly, at center region of the bottom of the hole 28 so that the shank of the contact may be accomodated in holes 27, 28, 29 of the supporting portion of the insulator body. In this figure same reference numbers indicate same portions or parts as FIGS. 3 9.

Therefore further descriptions are omitted for the simplification of the descriptions.

In above embodiment different constructions are applied between a plug member and a receptaCle memher. But as will be easily understood, one construction, as shown in either FIG. 8 or FIG. 10, may be applied to both plug and receptacle members.

A multi-contact connector has been described but this invention is, as clearly seen, applied to an electrical connector having one pair of mating contacts.

This invention provides a miniature and economical multi-contact connector which is simple in construction and producing method without any additional working after the contacts being pressed into the holes of the insulator body.

The used contact may be, preferably, made of and formed from a sheet of metal by a punching out operation and a following bending operation.

The insulator body may be, preferably, made of plastic materials by plastic molding operation.

This invention has been explained in detail relating to a particular embodiment, which is only for explanation of this invention, and various designations and modifications may be easily made to those skilled in the art.

We claim:

1. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a flat side surface, and at least one groove formed in an end portion of said projecting portion, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means engaging with said bottom of said first hole portion, a contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, a bent portion at the free end of said contact blade being received in said groove of said projecting portion, a terminal portion integrally extending from said shank in a opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion;

the improvement comprising, said shank of said contact comprising,

a flat plate portion integrally connected to said contact blade and said terminal portion, first and second wall portions extending from side edges of said flat plate portion in a direction perpendicular to said flat plate portion at a region near said contact blade, a third wall portion extending across said flat plate portion in a direction per pendicular to said'fiat plate portion and to said first and second wall portions to connect between said first and second wall portions at their edges to form a box-like portion near said contact blade, said box-like portion serving as said first means,

and finger tabs integrally connected to opposite edges of said flat plate portion near said terminal portion and extending in a direction perpendicular to said flat plate portion, said finger tabs extending toward said contact blade and gradually curving to depart from one another,

said contact supporting portion including said hole penetrating therethrough comprising,

said first hole portion having slightly less dimension than said box-like portion of said shank portion so that said box-like portion is interference-fitted into said first hole portion without establishing a space between said box-like portion and the sides of said first hole portion, said second hole portion having slightly greater dimensions than the thickness and the width of said flat plate portion of said shank so that said flat plate portion is loosely accommodated in said second hole portion,

and additional hole portions communicating between said first and second hole portions, being arranged along opposite sides of said second hole portion and having dimensions so that said finger tabs are able to be inserted therein with the free ends thereof being forced towards each other by surfaces of said additional hole portions.

2. The electrical connector member according to claim 1, wherein the free end of said contact blade convexly curves towards said flat side surface of said projecting portion of said insulating body and is reversely bent at the end thereof, the bottom of said groove at the end portion of said projecting portion being formed as an inclined surface to slidably receive said reversely bent portion of the contact.

3. The electrical connector member according to claim 1, wherein said terminal portion of said contact comprises a flat plate and side wall members extending from opposite sides of said flat plate in a direction perpendicular to the fiat surface of said flat plate, said side wall members continuously and integrally connecting to said finger tabs.

4. The electrical connector member according to claim 3, wherein said flat plate of said terminal portion comprises a tab near said shank which is connected to said flat plate at one end and stands up over said flat plate from said one end to serve as said second means for engaging with an edge of said second hole portion of the supporting portion of the insulator body.

5. The electrical connector member according to claim 3, wherein said side wall members are less than said first, second and third wall portions of said shank in the height on the surface of the fiat plate.

6. The electrical connector member according to claim 1, wherein said third wall portion across the flat plate portion of the shank comprises a first wall member integrally connected to said first wall portion and a second wall member integrally connected to said second wall portion, said first and second wall members being in engagement with one another.

7. The electrical connector member according to claim 1, wherein the flat plate portion of the shank of the electrical contact comprises an offset portion at an intermediate region thereof whereby said flat plate portion defines two different flat regions integrally interconnected by said offset portion, and each one of said different flat regions being confined in different ones of said first and second hole portions so that said flat portion having said ofi'set portion may be accommodated in said supporting portion.

8. The electrical connector member according to claim 2, wherein said reversely bent portion of the contact blade has a flat tongue portion at the end thereof received in said groove, said end of the projecting portion of said insulator body is provided with inward extensions over the groove.

9. The electrical connector member according to claim 1, wherein said first hole portion of the supporting portion of the insulator body has outwardly tapered inner surface at the mouth thereof so that said first, second and third wall portions may be readily inserted into said first hole.

10. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a fiat side surface, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means thereon engaging with a shoulder on said supporting portion, a bowed contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, the free end of said contact blade being positioned adjacent to the outer edge of said projecting portion, a terminal portion integrally extending from said shank in an opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion;

the improvement comprising,

said shank of said contact comprising,

a flat plate portion integrally connected to said contact blade and said terminal portion, a barrier extending across said flat plate portion near said contact blade in a direction perpendicular to said flat plate portion, said barrier serving as said first means,

and finger tabs integrally connected to opposite edges of said flat plate portion near said terminal portion and extending in a direction perpendicular to said flat plate portion, said finger tabs extending toward said contact blade and gradually curving to depart from one another,

said contact supporting portion'including said hole penetrating therethrough comprising,

said first hole portion having slightly less dimension than said barrier of said shank portion so that said barrier is interference-fitted into said first hole portion without establishing a gap therebetween, said second hole portion having slightly greater dimensions than the thickness and the width of said flat plate portion of said shank so that 'said flat plate portion is loosely accommo dated in said second hole portion,

and additional hole portions communicating between said first and second hole portions, being arranged along opposite sides of said second hole portion and having dimensions so that-said finger tabs are able to be inserted therein with the free ends thereof being resiliently engaged with the surfaces of said additional hole portions.

11. The electrical connector member according to claim 10, wherein said terminal portion of said contact comprises a flat plate and side wall members extending from opposite sides of said flat plate in a direction perpendicular to the flat surface of said flat plate, said side wall members continuously and integrally connecting to said finger tabs.

12. The electrical connector member according to claim 11, wherein said flat plate of said terminal portion comprises a tab near said shank which is connected to said flat plate at one end and stands up over said flat plate from said one end to serve said second means for engaging with an edge of said second hole portion of the supporting portion of the insulator body.

13. The electrical connector member according to claim 10, wherein said barrier comprises first and second wall portions extending from the side edges of said flat portion in a direction perpendicular to said flat plate portion, and a third wall portion extending across said fiat plate portion in a direction perpendicular to said flat plate portion and to said first and second wall portions to join between said first and second wall portions to form a U-shaped section near said contact blade. I

14. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a flat side surface, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means thereon engaging with said bottom of said first hole portion, a bowed contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, the free end of said contact blade being positioned adjacent to the outer edge of said projecting portion, a terminal portion integrally extending from said shank in an opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion;

the improvement comprising,

said shank of said contact comprising,

a flat plate portion integrally connected to said contact blade and said terminal portion, first and second wall portions extending from side edges of said flat plate portion in a direction perpendicular to said flat plate portion at a region near said contact blade,

a third wall portion extending across said flat plate portion in a direction perpendicular to said flat plate portion and to said first and second wall portions to connect between said first and second wall portions at their edges to form a box-like portion near said contact blade, said box-like portion serving as said first means,

said contact supporting portion including said hole penetrating therethrough comprising,

said first hole portion having slightly less dimension that said box-like portion of said shank portion so that said box-like portion is interference-fitted into said first hole portion without establishing a space between said box-like portion and the sides of first hole portion, said second hole portion having slightly greater dimensions than the thick-' ness and the width of said flat plate portion of said shank so that said fiat plate portion is loosely accommodated in said second hole portion. 

1. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a flat side surface, and at least one groove formed in an end portion of said projecting portion, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means engaging with said bottom of said first hole portion, a contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, a bent portion at the free end of said contact blade being received in said groove of said projecting portion, a terminal portion integrally extending from said shank in a opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion; the improvement comprising, said shank of said contact comprising, a flat plate portion integrally connected to said contact blade and said terminal portion, first and second wall portions extending from side edges of said flat plate portion in a direction perpendicular to said flat plate portion at a region near said contact blade, a third wall portion extending across said flat plate portion in a direction perpendicular to said flat plate portion and to said first and second wall portions to connect between said first and second wall portions at their edges to form a boxlike portion near said contact blade, said box-like portion serving as said first means, and finger tabs integrally connected to opposite edges of said flat plate portion near said terminal portion and extending in a direction perpendicular to said flat plate portion, said finger tabs extending toward said contact blade and gradually curving to depart from one another, said contact supporting portion including said hole penetrating therethrough comprising, said first hole portion having slightly less dimension than said box-like portion of said shank portion so that said boxlike portion is interference-fitted into said first hole portion without establishing a space between said box-like portion and the sides of said first hole portion, said second hole portion having slightly greater dimensions than the thickness and the width of said flat plate portion of said shank so that said flat plate portion is loosely accommodated in said second hole portion, and additional hole portions communicating between said first and second hole portions, being arranged along opposite sides of said second hole portion and having dimensions so that said finger tabs are able to be inserted therein with the free ends thereof being forced towards each other by surfaces of said additional hole portions.
 2. The electrical connector member according to claim 1, wherein the free end of said contact blade convexly curves towards said flat side surface of said projecting portion of said insulating body and is reversely bent at the end thereof, the bottom of said groove at the end portion of said projecting portion being formed as an inclined surface to slidably receive said reversely bent portion of the contact.
 3. The electrical connector member according to claim 1, wherein said terminal portion of said contact comprises a flat plate and side wall members extending from opposite sides of said flat plate in a direction perpendicular to the flat surface of said flat plate, said side wall members continuously and integrally connecting to said finger tabs.
 4. The electrical connector member according to claim 3, wherein said flat plate of said terminal portion comprises a tab near said shank which is connected to said flat plate at one end and stands up over said flat plate from said one end to serve as said second means for engaging with an edge of said second hole portion of the supporting portion of the insulator body.
 5. The electrical connector member according to claim 3, wherein said side wall members are less than said first, second and third wall portions of said shank in the height on the surface of the flat plate.
 6. The electrical connector member according to claim 1, wherein said third wall portion across the flat plate portion of the shank comprises a first wall member integrally connected to said first wall portion and a second wall member integrally connected to said second wall portion, said first and second wall members being in engagement with one another.
 7. The electrical connector member according to claim 1, wherein the flat plate portion of the shank of the electrical contact comprises an offset portion at an intermediate region thereof whereby said flat plate portion defines two different flat regions integrally interconnected by said offset portion, and each one of said different flat regions being confined in different ones of said first and second hole portions so that said flat portion having said offset portion may be accommodated in sAid supporting portion.
 8. The electrical connector member according to claim 2, wherein said reversely bent portion of the contact blade has a flat tongue portion at the end thereof received in said groove, said end of the projecting portion of said insulator body is provided with inward extensions over the groove.
 9. The electrical connector member according to claim 1, wherein said first hole portion of the supporting portion of the insulator body has outwardly tapered inner surface at the mouth thereof so that said first, second and third wall portions may be readily inserted into said first hole.
 10. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a flat side surface, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means thereon engaging with a shoulder on said supporting portion, a bowed contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, the free end of said contact blade being positioned adjacent to the outer edge of said projecting portion, a terminal portion integrally extending from said shank in an opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion; the improvement comprising, said shank of said contact comprising, a flat plate portion integrally connected to said contact blade and said terminal portion, a barrier extending across said flat plate portion near said contact blade in a direction perpendicular to said flat plate portion, said barrier serving as said first means, and finger tabs integrally connected to opposite edges of said flat plate portion near said terminal portion and extending in a direction perpendicular to said flat plate portion, said finger tabs extending toward said contact blade and gradually curving to depart from one another, said contact supporting portion including said hole penetrating therethrough comprising, said first hole portion having slightly less dimension than said barrier of said shank portion so that said barrier is interference-fitted into said first hole portion without establishing a gap therebetween, said second hole portion having slightly greater dimensions than the thickness and the width of said flat plate portion of said shank so that said flat plate portion is loosely accommodated in said second hole portion, and additional hole portions communicating between said first and second hole portions, being arranged along opposite sides of said second hole portion and having dimensions so that said finger tabs are able to be inserted therein with the free ends thereof being resiliently engaged with the surfaces of said additional hole portions.
 11. The electrical connector member according to claim 10, wherein said terminal portion of said contact comprises a flat plate and side wall members extending from opposite sides of said flat plate in a direction perpendicular to the flat surface of said flat plate, said side wall members continuously and integrally connecting to said finger tabs.
 12. The electrical connector member according to claim 11, wherein said flat plate of said terminal portion comprises a tab near said shank which is connected to said flat plate at one end and stanDs up over said flat plate from said one end to serve said second means for engaging with an edge of said second hole portion of the supporting portion of the insulator body.
 13. The electrical connector member according to claim 10, wherein said barrier comprises first and second wall portions extending from the side edges of said flat portion in a direction perpendicular to said flat plate portion, and a third wall portion extending across said flat plate portion in a direction perpendicular to said flat plate portion and to said first and second wall portions to join between said first and second wall portions to form a U-shaped section near said contact blade.
 14. In an electrical connector member, at least one contact of electrical conducting material and an insulator body for supporting said contact, said insulator body comprising at least one contact supporting portion having one hole penetrating therethrough which has a greater first hole portion and a smaller second hole portion interconnected to said first hole portion at the bottom of said first hole portion, an insulating projecting portion projecting from said contact supporting portion in an extending direction of said hole with a flat side surface, said at least one contact comprising a shank accommodated in the hole of said supporting portion with a first means thereon engaging with said bottom of said first hole portion, a bowed contact blade extending integrally from said shank portion along said flat side surface of said projecting portion, the free end of said contact blade being positioned adjacent to the outer edge of said projecting portion, a terminal portion integrally extending from said shank in an opposite direction of the contact blade and a second means engaging with an edge of said hole of said supporting portion at the opposite side thereof in relation to said projecting portion so that said contact may be prevented from falling off said insulator body by cooperating action between said first and second means and said supporting portion; the improvement comprising, said shank of said contact comprising, a flat plate portion integrally connected to said contact blade and said terminal portion, first and second wall portions extending from side edges of said flat plate portion in a direction perpendicular to said flat plate portion at a region near said contact blade, a third wall portion extending across said flat plate portion in a direction perpendicular to said flat plate portion and to said first and second wall portions to connect between said first and second wall portions at their edges to form a box-like portion near said contact blade, said box-like portion serving as said first means, said contact supporting portion including said hole penetrating therethrough comprising, said first hole portion having slightly less dimension that said box-like portion of said shank portion so that said box-like portion is interference-fitted into said first hole portion without establishing a space between said box-like portion and the sides of first hole portion, said second hole portion having slightly greater dimensions than the thickness and the width of said flat plate portion of said shank so that said flat plate portion is loosely accommodated in said second hole portion. 